Do note that the version sold by GOG is the PC port. As such it features several changes to gameplay that make parts of the game impossible.

If you wish to play the truly original Amiga version and don't have access to an Amiga and original Superfrog disk, you should look at purchasing Amiga Forever. IIRC Team 17 made their old Amiga games available for use via this licensed emulator.

A price point for under 5euro would also grant more sales, more publicity and more people buying overal basically, but tsk tsk tsk they never learn. But it'd prob go to 5 and lower on certain big sales.